1. the quality of being strong, solid, and well-built
2. the quality of being determined and not easily discouraged

Examples

• The sturdiness of the oak table impressed all the customers.
• We tested the sturdiness of the bridge before allowing heavy trucks to cross.
• The sturdiness of her character helped her overcome many challenges.
• The backpack’s sturdiness made it perfect for hiking trips.
• His mental sturdiness allowed him to handle criticism well.
• The sturdiness of the building’s foundation prevented earthquake damage.